'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'Admin' // 网页名称

const port = process.env.port || process.env.npm_config_port || 9528 // 设置本地运行端口号

// 配置详情介绍 https://cli.vuejs.org/config/
module.exports = {
  publicPath: './',
  outputDir: 'dist',
  // assetsDir: 'static',
  // lintOnSave: process.env.NODE_ENV === 'development',
  lintOnSave: false,
  productionSourceMap: false,
  devServer: {
    port: port,
    open: false,
    hotOnly: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // 跨域
    proxy: {
      // 只要axios请求中带有/api的url,就会触发代理机制
      '/api': {
        // 目标路径：target(我们要代理请求的地址)
        target: process.env.VUE_APP_BASE_API,
        // 允许跨域
        changOrigin: true,
        // 重写路径 api代替了目标路径
        pathRewrite: {
          '^/api': ''
        }
      }
    },
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    const CompressionWebpackPlugin = require('compression-webpack-plugin')
    if (process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test') {
      config.plugin('CompressionPlugin').use(
        new CompressionWebpackPlugin({
            filename: '[path].gz', // 压缩后的文件名(保持原文件名，后缀加.gz)
            algorithm: 'gzip', // 使用gzip压缩
            test: /\.js$|\.css$/, // 匹配文件名
            threshold: 10240, // 对超过10k的数据压缩
            minRatio: 1, // 压缩率小于1才会压缩
            deleteOriginalAssets: false // 是否删除未压缩的源文件，谨慎设置，如果希望提供非gzip的资源，可不设置或者设置为false（比如删除打包后的gz后还可以加载到原始资源文件）
        })
      )
    }
    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to 
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
